Message Box Rune Support Erroneous

Describe the bug As of version 1.5.0, the MessageBox still seems to take issues with runes. Something similar was recently report in issue #1657 (with a PR to solve this in PR #1658). Then again there was also issue #1665 (context menu width) which subsequently got solved in PR #1666. I think a similar bug fix is required for the MessageBox class.

Here’s a summary of the current state of message box:

language	-usc	result
en_US	false	works as expected
en_US	true	invisible message box
ja_JP	false	works but the alignment of the message box message is off
ja_JP	true	invisible message box

To Reproduce I noticed this behavior on the application I am currently working on (https://github.com/StefanGreve/dtui/tree/chatview). To reproduce this bug you can run this application with dtui.exe run --langauge [en_US|ja_JP] -usc. Try to log in (login method is not implemented yet, so any combinations of strings would do the trick) and cancel the process by clicking on the [ cancel ] button to trigger the message box.

Expected behavior The message box should be visible (notice that it is still possible to exit the message box form with the now invisible ok button). Also the Japanese text (and likely any other text which contains runes) should not be cut off. In the GIF below, the text is not really centered when the language profile is set to Japanese.

Screenshots

Desktop (please complete the following information):

• OS: 10
• Version 10.0.19044

Additional context This behavior was observed on CMD, PowerShell and Windows Terminal with always the same outcome. The example in the GIF was run on Windows PowerShell.

[StefanGreve]

In your gif it sort of looks like your MessageBox is popping under the main UI. Also according to your table en_US with -usc manifests the problem which makes it seem like its not to do with the language and instead to do with -usc?

Correct, the -usc parameter (which enables Application.UseSystemConsole) is meant to be a workaround for Windows Terminal where the TUI wouldn’t look correct if it were not for that. But even without -usc flag there is still the issue with the text alignment in the message box looking cut off on Windows PowerShell if there are any rune characters (see also: attached screenshot).

.\dtui.exe run --language ja_JP

Just for reference, this is the same table but for Windows terminal:

language	-usc	result
en_US	false	works as expected
en_US	true	invisible message box
ja_JP	false	see also issue #1661 (explained here
ja_JP	true	invisible message box

[BDisp]

@tznind is really a bug, but related to several factors, since TextFormatter, NetDriver and more, related with wide runes. I almost have a fix ready.